CNIM Practice Exam 1 with Complete Solutions

During a median nerve preoperative study, a patient has discomfort at the wrist. Stimulation electrodes are 10 mm gold disk, stimulus intensity is 20 mA, and stimulus duration is 100 μsec. Which of the following would most likely reduce the patient's discomfort while maintaining adequate stimulation? - ANSWER-Decrease number of repetitions What is not an advantage of epidural recordings? - ANSWER-Absence of significant artifact The stimulation rate is determined by the - ANSWER-analysis time Somatosensory evoked potentials are less reliable in patients with ? - ANSWER-Neuromuscular disease When placing PTN stimulator you should not - ANSWER-Secure the tape and bands around the whole ankle A differential amplifier with a Gain of 1,000,000 has a 0.2 μV signal at its positive input and a 0.8 μV signal at its negative input. The output will be: - ANSWER-A downward peak of 0.6V The lumbar potential is generated from - ANSWER-Post-synaptic responses The P31 response to posterior tibial nerve stimulation - ANSWER-Is recordable over a generalized region of scalp Which of the following has the greatest effect on SEP monitoring? - ANSWER-Sevoflurane A shocking sensation that occurs throughout the body during neck flexion is called - ANSWER-L'Hermittes sign Lowering the SSEP hicut filter from 500 Hz to 200 Hz may cause the cortical peaks to: - ANSWER-Appear longer in latency How many waves of a 60 Hz signal should you see in a 250 mS sweep? - ANSWER-15 Activation of an action potential of a neuron will depend on: - ANSWER-Its membrane potential based on the spatiotemporal summation of its excitatory and inhibitory inputs From left to right pre-auricular points is measured 30 cm. The C3 electrode is located: - ANSWER-9 cm medial to the left pre-auricular point